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First up at the hearing was FBI director James Comey

Is there such a thing as security so good it's a danger to society?

That's the bigger picture at hand as Apple continues to fight an order to unlock a terrorist's iPhone.

That fight made its way to Capitol Hill on Tuesday for a hearing in front of the House Judiciary Committee, the government body that covers matters relating to how law and order is enforced in the US.

Over the course of four meandering hours, representatives dived headfirst into the complexities of the case FBI director James Comey said is the most difficult issue he has ever had to deal with.

He told the committee that his organisation was seriously concerned by the growth of what law enforcement describe as "warrant-proof spaces" - the term given for methods of communication or storage that, even with the correct permission from the court, can't be accessed. Not by police and not by technology companies.

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Apple has strong support among its users - and from the technology industry

"If we're going to move to a place where it's not possible to overcome that," Mr Comey warned, "that's a world we've never lived in before in the United States."

Mr Sewell endured fierce exchanges with South Carolina Congressman Trey Gowdy, who was angry at what he deemed a lack of cooperation in this controversial case.

How is it possible, the Congressman offered, to live in a world where the FBI has the authority to stick a finger up someone's rear in search of drugs, but not the power to look at the locked iPhone of that same suspect?

There's no simple answer to that, of course, though Apple might contest that law enforcement's capability to carry out such physically intrusive actions doesn't increase the general public's risk of exposure to an unruly finger or two.

'No no no'

But, crass comparison aside, Congressman Gowdy's heated questioning eventually arrived at this key point - if Apple won't comply with this order, he thinks the company must at least be forthcoming in sharing what it is actually prepared to do.

In a similar vein, the session's soundbite moment came from the mouth of Congressman Jim Sensenbrenner, who scolded Apple for having the audacity to demand Congress do something without offering any solution itself.

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Congressman Trey Gowdy was at times irate at Apple's position

"All you've been doing is saying 'no no no no'," the Congressman said.

"You're operating in a vacuum.

"You've told us what you don't like. You haven't told us one thing about what you do like. When are we going to hear about what you do like so Apple has a positive solution to what you are complaining about."

Congress could, he added, continue unassisted by Apple, "but I can guarantee you aren't going to like the result".

Mother's diary

That's because, judging by some of the questioning during the session, some members of Congress consider it unfathomable that police cannot reach the information kept in Apple devices.

It's a barrier hindering many, many cases. Mr Comey could not say exactly how many phones the FBI wanted to unlock nationwide, other than that it was "a lot".

Later in the hearing, we learned that there are 205 locked iPhones currently held by police in New York alone.

We were reminded about a case involving Brittany Mills, an expectant mother who was shot and killed on her doorstep in Louisiana last year. Her baby boy died soon after.

Ms Mills - whose family attended the hearing - kept a personal diary on her phone that could contain crucial information about the murderer. The phone is locked, rendered unreachable by Apple's encryption software.

"I think about the nine-year-old girl who asked 'why can't they open the phone so we can see who killed my mother'," said Louisiana Congressman Cedric Richmond.

Mr Sewell said Apple had done a lot to help with that investigation, but without creating the kind of tool demanded by the FBI in the San Bernardino case, it would be unable to assist further.

Making a smarter FBI

But maybe someone else could?

Republican Congressman Darrell Issa - a favourite among tech enthusiasts thanks to his opposition to several bills considered to be anti-internet - gave Mr Comey a hard time over the process leading up to asking for Apple's help.

Mr Issa said the FBI had not explored all the options for accessing the data and circumventing Apple's security.

He said the FBI should be investing in bringing in people with that expertise, not relying on companies like Apple to do the work for them.

Point being - if the FBI could crack the phone itself, Apple's opposition would be irrelevant.

This call was backed up by the thoughts of Prof Landau, an independent cryptology expert who argued, with some force, that there was no way the FBI's request in San Bernardino could be carried out safely.

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The so-called Islamic State has used encrypted app Telegram to announce attacks

She said that while Apple could no doubt keep the code required to crack Syed Farook's phone a secret, the real issue is what will happen when Apple is subjected to possibly hundreds of requests to do the same thing on other devices.

She said the surge of orders would mean Apple would need to create a faster process to handle the task, one that would by its nature be vulnerable to exploitation through interception, or perhaps a rogue employee.

Prof Landau insisted the only real course of action was for the FBI to invest heavily in becoming smarter - rather than compelling Apple to make its products less secure.

Because a weakened iPhone would have one critical side effect, she said. Criminals would simply use other, more secure methods to talk to each other - apps created by countries outside the US, offering encryption mechanisms even more secure than those offered by Apple currently.